Which of the following pairs have identical bond order?

Options

A. `CN^(-) and NO^(+)`
B. `CN^(-) and O_(2)^(-)`
C. `CN^(-) and CN^(+)`
D. `NO^(+) and O_(2)^(-)`

Answer

A

Explanation

`CN^(-):KK(sigma2s)^(2)(sigma^(**)2s)^(2)(pi2p_(x))^(2)=(pi2p_(y))^(2)(sigma2p_(z))^(2)`
`"B.O."=(8-2)/(2)=3`
`NO^(+):KK(sigma2s)^(2)(sigma^(**)2s)^(2)(pi2p_(x))^(2)=(pi2p_(y))^(2)(sigma2p_(z))^(2)`
`"B.O."=(8-2)/(2)=3`
`O_(2)^(-):KK(sigma2s)^(2)(sigma^(**)2s)^(2)(sigma2p_(z))^(2)(pi2p_(x))^(2)(pi2p_(y))^(2)(pi^(**)2p_(x))^(2)(pi^(**)2p_(y))^(1)`
`"B.O."=(8-5)/(2)=1.5`
`CN^(-) and NO^(+)` have same bond order.